RasterLayer in alaska-albers (wkid=3387) cannot be displayed in BaseLayer in web mercator (wkid=3857)

Question

WPF app with MapView BaseLayer created from the tiled service, "https://services.arcgisonline.com/arcgis/rest/services/World_Topo_Map/MapServer".  I created RasterLayer from USGS tif file and associated xml file with wkid=3387 and put it into OperationalLayers.  I have another USGS tif file which has embedded spatial refernce as "Albers_Conical_Equal_Area" (Virginia) and has no problem showing in Map Operational Layer.  Both of them have SpatialReference.  The only difference is the one which cannot be shown as wkid set and the one which shows up has no wkid but wktext present with "Albers_Conical_Equal_Area".  I thought that Operational Layer in a different projection is mapped to be shown in the BaseLayer projection.  ArcGISPro v3.4 has no problem showing both Raster Layers.   Is there a way to show the alaska albers projection map to be shown in the web mercator?  We are using ArcGISRuntime 200.8.0.   I cannot submit the files (too big and .tif nor .xml are not allowed).

DiveshGoyal · Answer

Did setting the projection engine directory path help the raster layer detect its spatial reference correctly?

Currently there is no way to specify a specific datum transformation for the map. It'll pick a default one when displaying the layer depending on the layer's spatial reference.

YasunariTosa1 · Answer

It came up with 393 choices of DatumTransformationList for the TIFF file I have.  The worst is the default one is picked as wkid4269 to 4326, not wkid3338 to 4326.  There is no 3338 in the list.   Why?  Another question.   How can I specify the DatumTransformation to MapView.Map?   Google says mapView.Map.DatumTransformations.Add(selectedOne).  This does not compile.  The example I found is GeometryEngine.Project.   I need the selected DatumTransform applied to RasterLayer which is added to OperationalLayers.  Thanks.

By the way the tiff Wkid = 3338 (not 3387 I stated) and WkText is thefollowing:PROJCS["NAD_1983_Alaska_Albers",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-154.0],PARAMETER["Standard_Parallel_1",55.0],PARAMETER["Standard_Parallel_2",65.0],PARAMETER["Latitude_Of_Origin",50.0],UNIT["Meter",1.0]]

DiveshGoyal · Answer

Can you try downloading the projection engine data and pointing your app to it via TransformationCatalog.ProjectionEngineDirectory at startup. Sometimes that data is needed to properly recognize the spatial reference of raster files